Air filter



FIG. 1 is a top, front, right side perspective view of an air filter showing my new design;

FIG. 2 is an enlarged depiction of the left portion of FIG. 1 ;

FIG. 3 is an enlarged depiction of the right portion of FIG. 1 ;

FIG. 4 is a front elevation view thereof;

FIG. 5 is an enlarged depiction of the left portion of FIG. 4 ;

FIG. 6 is a back elevation view thereof;

FIG. 7 is an enlarged depiction of the right portion of FIG. 6 ;

FIG. 8 is a right side elevation view thereof;

FIG. 9 is a left side elevation view thereof;

FIG. 10 is a top, back, left side perspective view thereof;

FIG. 11 is an enlarged depiction of the right portion of FIG. 10 ;

FIG. 12 is a top, back, right side perspective view thereof;

FIG. 13 is an enlarged depiction of the left portion of FIG. 12 ;

FIG. 14 is a top, front, left side perspective view thereof;

FIG. 15 is an enlarged depiction of the left portion of FIG. 14 ;

FIG. 16 is a bottom, back, left side perspective view thereof;

FIG. 17 is an enlarged depiction of the right portion of FIG. 16 ;

FIG. 18 is a bottom, back, right side perspective view thereof;

FIG. 19 is an enlarged depiction of the left portion of FIG. 18 ;

FIG. 20 is a bottom, front, left side perspective view thereof;

FIG. 21 is an enlarged depiction of the left portion of FIG. 20 ;

FIG. 22 is a bottom, front, right side perspective view thereof; and,

FIG. 23 is an enlarged depiction of the right side of FIG. 22 .

The broken line showing of various features of the air filter form no part of the claimed design. 

CLAIM The ornamental design of an air filter, as shown and described. 